Drill and tap indicator.



l. l. D. BRISTOL.

DRILL AND TAP INDICATOR.

APPLICATION FILED NOV-1. ms.

Patented Nov. 13, 1917.

@0090 0 ,6 'e O O O V ,q

l-4 1-4 I 3 0 (D O G l0 6 :5 is O O O 0 a4 14 I2 I! O C) 0 0 20 24 24 2 WITNESSES Ea WW .HHWWMMHMM hHH Hu Z M II v w nnomvfrs JOHN- ISAAC evon- BRISTOL,

0F CHAPPAQUA, NEW: YORKu DRILL iA'ND :TAP INDICATOR.- f

Specification of Letters Patent." Patented N 13,

Application filed November 1, 1916.. Seria1 No.'128, 88 6,

TocaZZ 107mm itmay concern;

Be it known that I, Join; I; D;., BnIsToL,

a citizen of the United States, and a resident of Chappaqua, in the county of lVestchester and State of New York, haveinvented a new and lmproved Drill' and T an India cator, of which the following is a full, clear, and exact description.

This invention has reference generally speaking to a drill and tap indicator for holding various drills andtaps in easy and convenient reach, particularly for use on a metal workers bench for the support or -accommodation or" sets of samplescrewsand the drills and taps used in connectiontherewith.

Among the objects of the invention, therefore, is to provide a simpleandiconvenient holder for correlatedgroups or series of screws, drills and taps by which theproper tap drill and body drill and-the propertap for use in connection with any selected screw can be immedi'atelyselected without possibility of mistake or loss of time.

More definitely stated: By virtue ot the device, herein sho\vn, I provide a means \vherebya workman givein, for example, a certain size or sizes ot machine screws for l the assemblage of a job, may knowalmost instantly preciselv which drills andtaps to usefor any particular size or species of screw pro ided for the job and to so placethjem while in theintervals of use that other taps or drills cannot be mi -stakenlv used .j

With the foregoing andgjotherrobjects in view th'e invention consists in the arrangemeat and gcombinaticn of parts hereinafter described and claimed, and while the invention is notrestrictedtothe exactdetails of con struction disclosed for I suggested hereim still-for the purpose ofillustratinga practicalembodiment thereof 'referen fi, is had to the accompanying drawings, n which like reference charactersdejsignate, the .same parts in; the several views, and 'in which Figure 1 is a plan View of one form of' my improved indicator showing someof the sample screws in placean dfalso indicating a view of the drills andtap to be used in connection with the use of each particular scr w to be usedfor tllfijobQin hand;

Fig. 2 is a verticaltransverse section on the li-nef2- s2pt Riga-2;; and

Figs.- 3, 4:, and'5 are perspective views mewha i a ammat l n l atulresbut dicating slightly modified forms of-theejn-i dicator,

Referring now more particularlytoF'igs. 1 and 2,1 show a tap anddrill indicator comprising upper and lower parallel plates 10- and '11, the lattenof which may be, termed thej bas e, which is indicated as being supportedjupon any suitable number or arrangement of feet 12 In this form of-the' 7 invention, thepupper plate orholder 10; is165? supported in spaced relation above the base, bymeans'of a pair of standards 13, and the several supporting. devices are secured rigidlyto the platesby means of screws ls or" their equivalent; I

The iipper plate or holder is provided with groups or seriesof'holes, each group of'hole's being indicatedas four in number andrepresented by letters (1,1),- "0, andd: By preference these holes are allarranged in a straight line extending rearwardly from the front edge portion of the holderf The numberof"these 'groups may be varied indefinitely-according to the tap and drill indicator desired for the exigencies of a ny' particular kind of work to. be carried on, but as a practical'indi'cation ota device of this nature, lishowga device including four-,- te n of suchgroups for use with the fourteen I differentsized'screws indicated upon ithe usual screw gage incommon use. All of rtheholes of asimilar character may bearrangedin a straight line as a matter of convenience, although' thereis less necessity forthe linesto be straight'90- longitudinally of the holder than in th'e case otthe arrangement'of each group. .The holes a or the first holesfof all of the groups are fitted'tobeprovided with as many di-f-Q ferent-sizes' or types of screws indicated at' 15, oneofwhich-screws is keptin its own particularhole a, Thesescrews 15 :are, in. a full; sized indicator, thefourteen' different sized screws generallvused for lightworlqf and i are ident fied "or described by numbers l adjacent to the 7 upper edges of the holes, indicating the: caliber or number of the screws, with the number of threads to the inch and bvother numbers .acljacent;to the, otherholes in the same line, ind cating th e ;l05'- tap andbody drill to be used with that par-Q- ticular si 7,e or sample of screw, All the, holes, however, are smooth. and" have no; other ofiice than to l'IOl Cl'QtlIB SZImDlB screws v nd he .tW-ed. 1 edfihefiap iai 'e n ei e 'rl ne'ction th'erewith; l 7' n ot er; Words; D rectly t ihea eerc t:- cach hole a is located the hole b'of the'same group into wh ch may be fitted and held a drill which is of the precise caliber for boring the hole to be subsequently tapped to receive a screw of the type carried in a hole a of the same group. In another hole 0 in the same line of holes is held a body drill 0' of the exact caliber for drilling a hole to receive the shank or unthreaded part of the screw. in the hole (Z of the same group or line of holes, is kept a tap d which corresponds .ioth in caliber and number of threads per inch as the screw 15 pertaining to this group. It will be understood, therefore, that each group of holes will be supplied with one sample screw of a known or standard character carriel in hole a and that theremaining holes of the same series.

will be fitted with a tap drill. a body drill, and a tap corresponding to that particular. screw. The caliber of the holes I), c, and (Z should approximate the caliber of the tools tojbe held therein, although this is of secondary importance, the principal feature of the indicating means being the sample screw in each group. 7

7 Given a screw or set of screws of the same but unidentified character to use in a job, a workman by direct comparison will locate the gage or sample screw corresponding in number and number of threads per inch to the screws provided for the job. He then knows immediately without calipering his screws, counting the threads or other investigation, precisely which drills to use, the drills being thus found in the same group as the matched sample or gage screw.

In Fig. 3, the indicator comprises plates 10 and 11 which, as in Figs. 1 and 2, are held in spaced parallel relation to each other, and shows the extended base plate constitutin a fixed stop and support for the tools held removably in the various holes 5, 0, and (Z. In this form of the invention, however, the two plates are integral with each other or are formed from a single strip of sheet material, such as sheet metal or other rigid material, the rear edges of the plates being connected by a vertical portion 16. The feet 12 as indicated, are made from the same blank also and stamped out and turned down from the end of the base plate and perpendicular thereto.

In Fig. 4, the upper and lower plates are connected. by the vertical portion 16, and the indicator, like Fig. 3 is made from a sin- ,gle sheet of rigid material, but in place of the front feed 12' formed with the ends of the base, I may turn down a flange 12 from the front edge of the base to constitute the front support. In Fig. 5 I carry forward the same idea of using less length of metal by omitting all of the feet from the ends of 1,2ee,esc

the base and providinga downwardly turned roll or extension 12 to take the place of the rear feet 1%, and this extension merges thence upwardly into the vertical portion 16. This downward extension at the rear may be located back of all of the drills and taps and may have some width if desired to provide a pocket 16, in which a pencil, scriber, drill punch, or other devices may be held if desired. It will, of course, be understood that in all forms of the device. the upper or holder plate will be provided with groups of holes a, b, c, and d, serving the functions fully set forth in connection with Figs. 1 and 2, and will provide a front base or tool table 17, for holding the drill and tap selected for use, in order that they may not be niislaid during the intervals of temporary non-use.

I claim:

1. The herein described drill and tap indicator comprising a. pair of upper and lower parallel plates, the upper plate being provided with a plurality of series of groups of holes for sample screws, and drills and taps pertaining to such screws, and the lower plate being imperforate serving to support the drills and taps to be placed in the holes of the upper plate, said lower plate also being projected forwardly' beyond the front edge of the upper plate, means integral with the upper and lower plates serving to connect the rear edges of the same. said connecting means being deflected downwardly to form a support for the rear edge of the lower plate and a receptacle for the tools. andthe front. edge of th lower plate having an integral downdly projecting support, substantially as as forth.

The herein described drill and tap in ator comprising upper and lower plates, upper plate being provided with a pluity of series of. groups or holes for gage and drills and taps pertaining to screws, a plurality of gage screws in sa'c. screw holes and constituting a part of the indicator device, the lower plate being imperforate serving to support the drills and taps to be placed in the holesof the uper plate, said lower plate also being projected forwardly beyond the front edge of the upper plate, means integral with the up per and lower plates serving to connect the rear edges of the same whereby the upper plate is supported from the lower plate, and means integral with the front part of the lower plate serving to supportthe same, substantially as set forth.

JOHN isaac Devon BRISTOL.

c the Copies 01 this patent may he obtained for five cents each. by addressing the Commissioner of Patents. WashingtonJlG. 

